Another sample file
First page - no image likely colour space issue.
Second page - 4 jpg images, clipping and colour space issue.
Pushing out to 4.3
I've created PDF-373 to track 9919.pdf issues. Resent changes for PDF-319 have correct the original issue with blackbox.pdf and masking_error.pdf.
I've created PDF-374 to track a missing gradient and upside down image in blackbox.pdf on the second page. Otherwise I think this issue can be closed.